Healthy adults should aim for at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous aerobic activity a week. That doesn't have to be all at one time, though. Aerobic exercise can even be done in 10-minute increments.

And recent studies report significant health benefits from interval training, which means exercising at your near maximal intensity for short periods of 60 to 90 seconds.

For many people, walking is a great choice for aerobic exercise. In fact, walking is one of the most natural forms of exercise. It's safe, it's simple and all it takes to get started is a good pair of walking shoes and a commitment to include aerobic exercise in your daily routine.

Of course, there's more to aerobic exercise than walking. Other popular choices include swimming, bicycling and jogging. Activities such as dancing and jumping rope count, too. Get creative.

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